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They're former Disney darlings turned pop stars who've battled personal demons in the public eye, and now they're judging The X Factor.

With everything they have in common, you'd think Britney Spears, 30, and Demi Lovato, 19, would become fast friends. But in fact, the two singers can't stand each other — and their fiery feud is making working on the X Factor set unbearable!

"Tensions are at the boiling point," a show insider tells Star. "There is a bitter rivalry between them, and it's already pretty much exploded — which is crazy considering how early into filming it is."

"Demi thinks Britney is a twit, and Britney thinks Demi is beneath her," another source says. "They avoid each other as much as possible when the cameras aren't rolling."source

Has Britney ever been in a feud with anyone (excluding KFed)? She seems like the nicest person tbh I cannot see her having bad feelings toward anyone, especially Demi since both have gone through bad times. If anything, Britney probably understands Demi's issues better than a lot of people.